WATCH: "All Of Me" Duet By JOHN LEGEND And TAYLOR SWIFT!

When you take a Legend-ary R&B singer to duet with the absolute pop star of today's generation, you'll get an epic performance just like this one! During the fourth night of Taylor Swift's 1989 tour at the Staples Center, she joined John Legend to perform his hit "All Of Me"!

It's definitely not something we see or hear everyday! So watch a clip of their performance below: